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"Best Shape Of My Life" mini-study - Baseball Prospectus
Investigating the "Best Shape" Phenomenon by Rob Pettapiece "...hitters in the 'best shape of their lives' would increase their offensive output by about 3%." A quick read, but interesting. If he really wanted to take a wider look at the phenomenon, he could use SBN to have team blogs track what players state that they are in the "Best Shape Of My Life".
